December 22 – On December 21, local time, an American F-15 fighter suddenly caused a sonic boom while flying over central Illinois, causing panic among local residents, who reported the case to the police station one after another.
According to a BBC report on the 21st, the Illinois Emergency Management Agency said in a statement that it received an alarm at about 11:20 that day that many residents in central Illinois felt loud noise and vibration. Authorities in Illinois said that after working with federal, state and local agencies, it was found that the loud noise was a sonic explosion produced by a military fighter plane, and the pressure waves generated caused perceive noise and vibrations in the area. At present, there are no reports of noise-induced damage.
Klein, deputy director of the Dicette City Fire Department in Illinois, told the media that the noise caused a large number of residents to call the police and the fire department to call the police. He also climbed up the roof and looked around after hearing the loud noise, but he didn’t see smoke or anything. Klein said that the noise was so loud that he thought “someone dropped the heavy object upstairs”.